Electric furnace.



A TT ORNE Y 3 SHEETS-SHEET l.

Patented Dec. 17, 1918.

L. L. SIMPSON. y ELECTRIC FURNACE.

APPLlcATloN man JULY 24. m5.

WTNESSES:

L. L. SIMPSON. ELECTRIC FURNACE.

APPLlCATlON F1LED JULY 24. 1915.

Patented Dee. 17, 1918.

3 SHEETS-SHEET 2. 2/

W/TNESSES:

A TTOR/VEY L. L. SIMPSON.

ELECTRIC FURNACE.

APPLICATION FILED IULY 24. 1915.

1 ,288,240. Patented Dec. 17, 1918.

3 SHEETS-SHEET 3- IIIIIIII I fue.

A TTOHNEI/ UNITED STATES PATENT oEEioE.

mio-'n smsen, `or SEATTLE, 'wnsnmcroim nssieiion To ADRIAN n. snonrn, or smarte, WASHINGTON.

ninc'rrt'rc romance.

4Specification offIietters Patent.

Patented Dec. '17, 1918.

Application ledd'uly 24, 1915. Serial No. 41,743.

` of, electric furnaces, and .consist of cooling fineans comprising a water jacketed head car-bon electrode, .water jacketed furnace cover, and water 'iacketed copper bottom of the ear-bon electrode.

The principal objects of `1the inventions and the cpurposes for which the same .are

especially "adapted, are .to .provide improvefmen'ts in fthe -economical operation .of .such

`furnaces in the processes of the manufacture of iron, steel and its alloys, and Lin .the .reduct-ion of ores, minerals .and jmetals, Vand while permitting intensely `high ztemperatures insuch furnaces maintaining allower than otherwisepossible, in .the

plate contact of the carbon crucible, electrode, and also 'prolonging' and extending the useandendurance-of .such metal, arts, and by which, together with a .regu ating device, to `greatly reduce the resistance to electric current and consumption of .electricity, -andalso to precipitate the metallic gases -into the .metal bath, preventing the divergence of electric-currentto the walls of the-furnaca'and,directing the same into Ithe center ofthe fbath, and\to improve the 4utilizaftionin said processes .0f a-cokeof .highash percentage.

By means ofmy water iacketed covers,

'fthe-same are kept sufficiently acool to :pre'

cipit'ate all metallic 4.gases .into fthe .metal fbath, "and avoid "conducting electric current "t0 the :side wallsofx the ffinnace, .thereby also avoiding the rapid burning tout of :such

walls.

Use of. an automatic regulating device vavaidsfthe necessity of 'labor Yof watchman iasats-present requ1red,r and by .securing Auni- Aforialiity -amperage greatly reduces :the

cesiunption' -of electric current, .andrfvery greatly lengthens 'the lasting use anddlfepf the carbon electrodes, as well as -avoids the .frequent burning out ofthe refractoryllinof vthe furnace.' 0

y means of a combination of cupola with 'iietheitofl 'opposite e ectrode consisting 'of a carbon:

`electric furnace, whereby the charge is re- `with blast .furnace cupola.

Figure 1 is a sectional side view of blast furnace cupola and electric furnaces 5 Fig. 2 is a top view of water )ticketed copTper bottom contact plate;

1g. 3 is an enlarged side view of water jacketed head 0f upper carbon;

Fig. .4de a vertical section of water jacketed head of upper carbon, on broken line ma of Fig. 3, showing receptacle for water;

Fig. 5 is a cross section of water jacketed head of upper carbon,at yy vof Fig. 4', and showing receptacle for water;

Fig. 6 is atop view of water jacketed furnace covers;

4 Fig. is a side view of automatic regulat- 1n device.

'y invention relates to such improved construction of electric furnaces as secures economy in the use of electricity in the reduction of ores to metal and the manufacture of iron, steel and alloys. It comprises improvements in suchelectric furnaces consisting of a square receptaclelO constructed of brick or otherwise, lined in the upper portion with refractory brick, and at bottom with carbon paste 1l, forming an interior carbon Crucible, underneath of which is a heavy .copper plate 12. A metal tap 13 is situated at bottom of the Crucible, and a i seriesof split head copper bolts 1.4 Cast into the platsand clamps, and such CQPPer plate 1 2 .is connected with a common .electric trallfolimer by Aa seriesof round wire cables e dem'. through anarerture said furnace. is an upper and i5. menging es slightly bevalt@ at the iimer of such carbon shaft electrode is to the copper head and suspended by a supporting cablc20, from over head, passmg over a sheave 22 on a trolley 23 and down of such transformer. The t'op or upper end astenedj around a sheave 21 in the copper electrode' head, thence back over another sheave on theV trolley 23, thence over to a w'all and down to a drum. The electric cables are fastened to such copper head by means of bolts 25 and clamps 26. Such suspended carbon shaft electrode is adjustable in ele'- vation by means of the supporting cable and controlling a device as hereinafter described, `so that the same may be raised or lowered tonecessary position as to the car- `20 bon crucible 11 to produce an electric arc.

' A common transformer (not shown) is situated near the furnace md converts the electrlclty to high amperage, and from high to low voltage and eachof such cables 15 and 1 9, connecting the electrdes'll and 17 with the transformer, is to carry about 1,000 amperes.

My water jacketed carbon electrode head 1n the top of whlch is a receptacle 31, for

water, embracing space horizontally commensurate with the size of the carbon electrede shaft 17, and has a circular opening 32 1n center, surrounded by a wall 33, equal 1n height with to of receptacle 31. This openmg 1s to fac' itate the removaljof the carbon shaft 17 from the copper h'ead 18, and the`forcing of --trode' head receives the carbon electrode shaft 17 frombelow and is attached thereto, and contact therewith formed, by leans of copper setbolts 34, threaded through the outer dependm wall of the copper head 18, and screwed ha bon electrode'17. Contact of the electric cables with 'the electrode head is accomphshed by means of corrugations- 35 cast on the exterlor of the head 18, -to receive half of the round electrlc cables, and Vby clamps 26 to recelve other half, fastened with bolts v 25 tapped msuch head. The head is proected upward above thewaterjacket 01'- tlon to ca the insulated sheave 21. e receptacle or water is connected with a water supply and circulation eilected through intake v(i6 and overflow --67 Pl (not shown). Q c water ack 1s constructed eted furnace top and cover 0r ,crucible, with casi-,1u

38,'a11d the 38 recgesive and-'hold four onow. cast Iron-doors or covert: 39, oneon @ich 0f the four sides. The doors. are

37 set as hinges an insulated base wit an ammeter 44 mount- 18, includes a copper casting in one'piece,l

the same free. AThe elec f inch or more into car.

by hose l by means of a sole plate rim; to. 36 sltuated upon the top of the furnace well and gave naeaeeo rings .40 for lifting, and the hollow 39" in each door is to be filled with water and to be connected at 64, for intake and -over- 'ow, by'hose pipe 41, with a water supply for circulation.`

My water jacketed bottom contact copperA plate 12,- is situated upon a series of close return, brass pipes 42 carrying water) and which are immediate y underneath and against the plate 12. v 'llhe' pipes 42, are packed with asbestos cement, and connected for intake and overflow by hose or pipes 43, to water supply for circulation.

rllhe automatic re ating device includes ed onits upper half and below it two metal arms 45 and 46 are pivoted at 47, and extend out to the outer side of the insulated base. ln the outer end 48, of arms 45, 46, is an insulated receptacle for a carbon plug 49, and immediately above each of such arms, on the outer side of the base, is a metal bracket carrying a copper plug 50,50; below the center of each arm is a' magnet coil 51, 51 vattached to the insulated base and having a movable plungerv 52, 52 attached by the link 53, 53 to its metal arm 45. Below such plunger 52, is a shelf 54, with a rubber cushionI to receive the plunger when in its lower position as shown. 0n ammeter 44 is a dial recording arc 55, and immediate] below it is another arc 56 of ber or har rubber perforated with holes 57 at certain distances apart and fitted with removable metalpin 58, 58 to be attached with direct ,100

circuit line. There is a needle .59 having a platinumrcross pin 60 which' 1s connectedV with a direct circuit line leading to an electricsource 61. As Vthe needle 59 moves and forms contact by a platinum point with a metal pin, the direct current eircult 1s closed, then the magnet is energlzed and plunger 51 rises closing circult between the metal arm 45 and bracket 50, .closing the alternating circuit to a reversible motor 62 causing the motor to move the electrode o 'the furnace when amperage is increased or reduced as case may be. When the contact on thedial of directsirguit is bli'gker the vdener ed magnet y gravi ,y ops the ms] arm 45 back to place and breaks contact with -motor 62. The current transformer-63 takes its power frommduced curren@ generated byl the'man cables 15 or V19 passing through it but not connected therewith. f

I am aware, that prior to my invention .electric furnaces with carbon shaft and crucible have beenl constructed, and 1 do not claim thereon, but having thus described my 125 invention,

I c1aim:---- y 1.` An electric furnace having, in comblnatiom an adjustable carbonelectrode,' and -a caporfhol'der forthe carbon comprising zii-1:10

5 securing the carbon in said socket, the chamber provided with an opening for facilitating efection of the carbon.

2. n an electric furnace, a carbon holder having a chambered head, a socket below 10 said head for a carbon, the side of the socket having depending llanges, and means passing through the flanges to secure the carbon.

3. ln an electric'- furnace, a cap plate therefor, and a cover structure comprising a pair of parallel side leaves spaced at their inner edges when laid to close the furnace, a pair of' other leaves of a width approximately the distance between thel close side leaves, whereby when all the leaves are closed, each coperates to form an opening for a carbon. In witness whereof l hereunto subscribe my name this 12th day of July, A. D. 1915.

LEO L. SIMPSON. Witnesses:

v N. S. PETERSON,

REUBEN D. Hmm. 

